Warning: Permanently added '10.128.0.149' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   83.367103][ T9615] IPVS: ftp: loaded support on port[0] = 21
[   83.397897][ T9615] netlink: 16 bytes leftover after parsing attributes in process `syz-executor016'.
[   83.449899][ T9615] ------------[ cut here ]------------
[   83.455525][ T9615] refcount_t: underflow; use-after-free.
[   83.461559][ T9615] WARNING: CPU: 1 PID: 9615 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0
[   83.470952][ T9615] Kernel panic - not syncing: panic_on_warn set ...
[   83.477529][ T9615] CPU: 1 PID: 9615 Comm: syz-executor016 Not tainted 5.6.0-rc5-syzkaller #0
[   83.486187][ T9615] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   83.496230][ T9615] Call Trace:
[   83.499506][ T9615]  dump_stack+0x188/0x20d
[   83.503819][ T9615]  ? refcount_warn_saturate+0x190/0x1e0
[   83.509427][ T9615]  panic+0x2e3/0x75c
[   83.513311][ T9615]  ? add_taint.cold+0x16/0x16
[   83.517973][ T9615]  ? __probe_kernel_read+0x188/0x1d0
[   83.523258][ T9615]  ? __warn.cold+0x14/0x35
[   83.527810][ T9615]  ? __warn+0xd5/0x1c8
[   83.531940][ T9615]  ? refcount_warn_saturate+0x1d1/0x1e0
[   83.537554][ T9615]  __warn.cold+0x2f/0x35
[   83.541829][ T9615]  ? refcount_warn_saturate+0x1d1/0x1e0
[   83.547357][ T9615]  report_bug+0x27b/0x2f0
[   83.551674][ T9615]  do_error_trap+0x12b/0x220
[   83.556241][ T9615]  ? refcount_warn_saturate+0x1d1/0x1e0
[   83.561768][ T9615]  do_invalid_op+0x32/0x40
[   83.566163][ T9615]  ? refcount_warn_saturate+0x1d1/0x1e0
[   83.571690][ T9615]  invalid_op+0x23/0x30
[   83.575820][ T9615] RIP: 0010:refcount_warn_saturate+0x1d1/0x1e0
[   83.581951][ T9615] Code: e9 db fe ff ff 48 89 df e8 9c 10 20 fe e9 8a fe ff ff e8 62 52 e3 fd 48 c7 c7 00 aa 51 88 c6 05 85 68 d2 06 01 e8 d7 62 b5 fd <0f> 0b e9 af fe ff ff 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 55
[   83.601531][ T9615] RSP: 0018:ffffc90001d97d38 EFLAGS: 00010286
[   83.607571][ T9615] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   83.615523][ T9615] RDX: 0000000000000000 RSI: ffffffff815bf511 RDI: fffff520003b2f99
[   83.623484][ T9615] RBP: 0000000000000003 R08: ffff88808ba16100 R09: 0000000000000000
[   83.631436][ T9615] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888094a34040
[   83.639395][ T9615] R13: ffff888094a34044 R14: 00000000000002ab R15: ffff8880920b6580
[   83.647390][ T9615]  ? vprintk_func+0x81/0x17e
[   83.651982][ T9615]  ? refcount_warn_saturate+0x1d1/0x1e0
[   83.657512][ T9615]  free_nsproxy+0x445/0x4a0
[   83.662010][ T9615]  switch_task_namespaces+0xaa/0xc0
[   83.667200][ T9615]  do_exit+0xb2f/0x2dd0
[   83.671361][ T9615]  ? mm_update_next_owner+0x7a0/0x7a0
[   83.676793][ T9615]  ? up_read+0x1ab/0x750
[   83.681052][ T9615]  ? mark_held_locks+0x9f/0xe0
[   83.685802][ T9615]  ? down_read_non_owner+0x470/0x470
[   83.691071][ T9615]  ? handle_mm_fault+0x491/0xa10
[   83.695993][ T9615]  do_group_exit+0x125/0x340
[   83.700566][ T9615]  __x64_sys_exit_group+0x3a/0x50
[   83.705579][ T9615]  do_syscall_64+0xf6/0x7d0
[   83.710067][ T9615]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   83.715934][ T9615] RIP: 0033:0x43f998
[   83.719814][ T9615] Code: Bad RIP value.
[   83.723875][ T9615] RSP: 002b:00007ffc7b243ff8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   83.732259][ T9615] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000043f998
[   83.740379][ T9615] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001
[   83.748328][ T9615] RBP: 00000000004bfa10 R08: 00000000000000e7 R09: ffffffffffffffd0
[   83.756293][ T9615] R10: 0000000120080522 R11: 0000000000000246 R12: 0000000000000001
[   83.764261][ T9615] R13: 00000000006d11c0 R14: 0000000000000000 R15: 0000000000000000
[   83.773820][ T9615] Kernel Offset: disabled
[   83.778200][ T9615] Rebooting in 86400 seconds..